<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>初始vue</title>
    <script type="text/javascript"  src="../js/vue.js"></script>
</head>


<body>
    <div id="root">
        <h2>今天天气很{{info}}</h2>
        <button @click="isHot=!isHot">切换天气</button>
    </div>
</body>

<script type="text/javascript">
   Vue.config.productionTip=false;
 
    let vm =new Vue({
        el:"#root",
        data:{
            isHot:true
        },
        computed:{
            info(){
                return this.isHot?"炎热":"凉快"
            }
        }
    })
</script>
</html>